Browse Prior Art Database

Variable Transmission Line Tape

IP.com Disclosure Number: IPCOM000086059D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Bentivegna, SA: AUTHOR

Abstract

Conventional "stripline" transmission line prototype circuits are made by either chemically etching or mechanically milling the transmission lines from copper-clad circuit boards having a ground plane. These lines normally require artwork (e.g., lithographic techniques) or precision scribing (e.g., mechanical removal).

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Variable Transmission Line Tape

Conventional "stripline" transmission line prototype circuits are made by either chemically etching or mechanically milling the transmission lines from copper-clad circuit boards having a ground plane. These lines normally require artwork (e.g., lithographic techniques) or precision scribing (e.g., mechanical removal).

Shown in Figs. 1 and 2 is a simplified transmission line adaptable for varying impedance requirements. The line comprises the lamination of two thin copper coatings or layers 1 and 2 on opposite faces of a flexible dielectric film 3. The sandwich is characterized with preprinted lines 4 defining the indicated impedance which can be obtained by severing, along a selected line 4, unwanted portions of the sandwich. Thus, the transmission line of Figs. 1 and 2 serves as a variable unit with different impedances obtained by cutting away unwanted portions.

Fig. 3 shows another application of the transmission line by soldering one of the copper coatings 1 or 2 to a ground plane 5 of a conventional copper-clad board 6, and utilizing the other of copper coatings 1 or 2 as a signal line with the dielectric film 3 therebetween.

Figs. 4 and 5 illustrate the use of the transmission line as a splitter and for impedance conversion which can be obtained by proper geometrical cutting of the line.

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